INGREDIENTS
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1 butternut squash, peeled and cut into 1/2-inch cubes
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2 tablespoons extra-virgin olive oil
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Kosher salt
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1 onion, halved and sliced
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2 tablespoons unsalted butter
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10 sage leaves
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1/4 cup all-purpose flour
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4 cups whole milk
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Pinch of freshly grated nutmeg
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Unsalted butter, for the baking dish
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1 cup grated fontina cheese (about 4 ounces)
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1 cup grated low-moisture mozzarella cheese (about 4 ounces)
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1 cup grated parmesan cheese (about 4 ounces)
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1 tablespoon all-purpose flour
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9 no-boil lasagna noodles